Multiple choice

Which of the following is not used in standard procedure of Gram staining?

  1. Iodine

  2. Carbol fuchsin

  3. Acetone and Ethanol

  4. Fuchsin and safranin

  5. Crystal violet

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbol fuchsin is not included in gram staining. It stains species of Mycobacterium tuberculosis that do not stain with the standard laboratory staining procedures like Gram staining.